1. Key Laboratory of In‐Fiber Integrated Optics College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 150001 China
2. College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China
3. Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of Education School of Physics and Electronic Engineering Harbin Normal University Harbin 150025 China
4. School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China